As VeloNation reports, "The Armstrong Lie" was originally intended as an inspirational movie. Oscar-winning director Alex Gibney started working on the film in 2009, when Armstrong came out of retirement to compete in the Tour de France. The filmmakers were granted extensive access to Armstrong and his entourage.

As allegations against Armstrong gained credibility, followed by Armstrong's admission of systematic doping, the emphasis of the documentary shifted.

“We set out to make a movie about a comeback -- with unlimited and unprecedented access to Armstrong and the inner workings of the Tour de France,” producer Frank Marshall said. “Along the way, we ended up chronicling the collapse of one of the greatest myths and legends of our time.”

No release date for the film has been named. It will be distributed by Sony Pictures Classics.

Last year, Armstrong received a lifetime ban from the United States Anti-Doping Agency. Major marathons have interpreted that ban to include his participation in their races.